Jonathan would've been one of Peter Griffin's friends if he did not drink alcohol, as revealed in "Friends of Peter G". He is seen sitting with friends Peter, Philip, and Ernest at The Drunken Clam. He does not like being nicknamed, as he prefers to be called Jonathan. He, like his friends, prefer milk instead of beer.
In the DVD cut, the four friends take a critical view of Jay Leno's humor and dot on their spouses.